This PR replaces__sleep/wakeup() by__(un)serialize(), for throwing and internal usages.

This follows the merge ofphp/php-src#19435

While this change on 8.5 might be reverted (seehttps://wiki.php.net/rfc/soft-deprecate-sleep-wakeup), we can still remove all those cases.

This DOES NOT replace all use cases of__sleep/wakeup(). We did so already on branch 7.4, but doing it on branch 6.4 is another story. This would basically be way to risky IMHO, with a bunch of non-trivial code to add just to fix the deprecation.

My recommendation for those remaining use cases is to ignore the deprecation. By the time ppl will move to PHP 8.5, they will also move away from Symfony 6.4

I'll submit another PR to the phpunit-bridge for that.

For the record, here is the list of files/classes that cannot be "just" migrated to__(un)serialize()
(I'll let the reader wonder about how they could be - and compare their ideas to what we did in 7.4):

• src/Symfony/Component/HttpKernel/Profiler/Profile.php
• src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
• src/Symfony/Component/HttpKernel/Kernel.php
• src/Symfony/Component/String/AbstractString.php
• src/Symfony/Component/String/LazyString.php
• src/Symfony/Component/Mime/Part/SMimePart.php
• src/Symfony/Component/Mime/Part/TextPart.php
• src/Symfony/Component/Mime/Part/DataPart.php
• src/Symfony/Component/Validator/Constraint.php
• src/Symfony/Component/Validator/Mapping/GenericMetadata.php
• src/Symfony/Component/Validator/Mapping/MemberMetadata.php
• src/Symfony/Component/Validator/Mapping/ClassMetadata.php
• src/Symfony/Component/Serializer/Mapping/AttributeMetadata.php
• src/Symfony/Component/Serializer/Mapping/ClassMetadata.php